IJSTE - International Journal of Science Technology & Engineering | Volume 3 | Issue 01 | July 2016 ISSN (online): 2349-784X All rights reserved by www.ijste.org 401 Treatment of Sewage by Partially Submerged Three Stage Rotating Biological Contactor (RBC) Jayamala Nitin A. Deshpande M. Tech Scholar Assistant Professor Department of Civil Engineering Department of Civil Engineering KLS Gogte Institute of Technology, Belgaum, India KLS Gogte Institute of Technology, Belgaum, India Abstract Due to fading of natural water resources (Surface source), sewage treatment is becoming more critical. The disposal regulations of sewage discharge firmer have reduced levels of contaminants allowed in waste-streams (nallah). The sewage management extreme objective is the assurance of the earth in a way too equivalent the general well-being and financial concerns. Understanding the nature and characterization of the sewage is essential for the design of appropriate sewage treatment plant and sanitation technologies. This project is study to show the general sewage characteristics collected from the sewage treatment plant and also to treat the domestic sewage by attach growth process. The attach growth process considered for treating domestic sewage is Rotating Biological Contactor (RBC) model. Result showed removal efficiency for partially submerged Rotating Biological Contactor (RBC) for Biochemical Oxygen Demand was efficient for rotational speed of disc at 6rpm. It is also seen that after treatment the values are within desirable limits of effluent standards as per CPCB, New Delhi. Keywords: Sewage Treatment Plant, Hydraulic Retention Time, Organic Loading Rate, Rotation per Minute _______________________________________________________________________________________________________ I. INTRODUCTION The wastewater that streams in the wake of being utilized for local (domestic), industries, manufacturing and different purposes is called as sewage. It is no doubt understood that sewage from local point contains suspended solids, pathogens, natural and inorganic toxins. Keeping in mind the goal is to diminish the well-being dangers (health hazards) and for safe transfer of sewage these contaminants and impurities should be cut down as far as possible. Thus, removal of the contaminants and pathogens from sewage is of preeminent imperative for its reuse in distinctive activities. Sewage comprises water as the main constituent, while other constituent includes organic waste and chemical [1] . To safeguard public health and the environment assessment of water and sewage is very crucial. The major source of water contamination is the discharge of sewage, which is adding to the interest of sewage and natural loading of the water bodies, algal blooms, advancing harmful and prompting destabilized sea-going biological system [2] .The issue is intensified in areas where effluent treatment systems are simple and not temperate. The conventional wastewater treatment advances in received in industrialized countries are expectionally lavish to manufacture, keep up and work particularly for the de-centralized communities. Research efforts are in progress for the development of the treatment technologies related to the de-centralized communities [3] . The domestic sewage is the wastes from food preparation, garbage-grinding, dishwashing, showers, baths, sinks and toilets. However, the municipal sewage is a composite mixture of liquid wastes flushed down sewers from the sources of industrial, residential, commercial and institutional. Sewage comprises human wastes and bathroom tissues, which flow to the treatment facility in more quantity in the form of suspended fibrous material and dissolved organic matter, and these add to the loadings of nitrogen, phosphorous and pathogens. The wastes from these substances are chiefly designed and treated in the municipal sewage treatment plants (STPs) [4] .The unstable organic matter ranging from 60 to 80% is present in the primary sedimentation tank of sewage treatment plant. Further by the biological treatment processes the colloidal and the dissolved organic matter, which passes from the primary clarifiers, without any settling has to be removed. The organic matter characteristics is changed and thus by oxidation and nitrification these substances are converted to stable forms like nitrates, sulphates etc and therefore biological treatment is carried out [4] . II. MATERIALS AND METHODOLOGY Sample Collection: Sewage was collected from the sewage treatment plant of KLS GIT campus, Belagavi for this study. The disposal of the sewage is used for gardening in the campus. The flow diagram of Sewage Treatment Plant (STP) for KLS GIT, Belagavi is shown in Fig 1.